Air feeder for furnaces



Aug. 4, 1925. l1,548,360 D. YGCJFF AIR FEEDER FOR FURNACES` Filed Nov. 12, 1924 ATTORNEYS.

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Patented Aug. 4, 1925i.

UNITED STATES PATENT DANIEL GOFF, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO RETTIE PHILADELPHIA, PENNSYLVANIA.

OFFICE.

IVI. GOFF, OF

AIR FEEDER FOR FURNACES.

Application led November 12, 1924. Serial No. 749,363.

To ZZ tolle-my faim/y conf-ern Be it known that I` DANiiai. Gorre, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new` and use-- ful Air Feeder for Furnaces, of which the following vis a specification.

It is well known that the gases generated by burning -coal and other fuels, and particularly the carbon contained in said gases may be completely burned if mixed with a sull'ieient quantity of hot air, and ignited before said gases are permitted to cool to any appreciable extent.

The present invention provides an iniproved means for heating and deliif'ering air,

and mixing the air with the gases in a region of comparatively high heat in the furnace. The invention also provides an air and gas mixing device which in no way interferes with the st okingI and operation of the fuinaee, and may be easily applied to many standard makes of furnaces which ordinarily have little, if any, provision for conipletely consuming the gases distilled in such furnaces.

This invention relates to the subject of tire boxes for furnaces and the like, and the primary aim of the same is to providesimple, novel and thoroughly practical means for feeding heated air to the fire so` that the heated air will eoniiningle with the gases arising` fi'oiii the lire, and thereby pro duce perfect combustion.

Gene lally speaking the. invention conteniplates tlie delivery of highly heated air, under pressure, to discharge outlets which may be in the form of nozzles, tuyeres and the like, located in the fire box above the fire and relatively positioned so that the air jets meet at the center of the fire and spread in the formof an air film directly over the tire, and cause the gases arising from the fire to cominingle and thoroughly mix With the air, and through such eommingling and mixing .are entirely consumed, the result being that a thorough and perfect combustion is obtained with an increase of heat and the entirel elimination of smoke or soot.

I accomplish a thorough heating of the air by the provision of air supply pipe lines disposed longitudinally in the walls ofthe furnace, and in this connection the invention further contemplates the provision of a novel arrangement whereby an `equal dis- 'tribution of air pressure. is procured in the .series of nozzles o1 tuycrcs projecting from said supply pipe lines.

For the purpose of illustrating my inven? tion, I have shown in the accompanying drawings forms thereof which are at. present preferred by nio, since tliev will give iiipractice satisfactory and reliable results, although it-is to be understood that the various instruinentaltiics ol' which my iiiveiition consists can be variously arranged and organized and that iiiy invention is not' limited to the pret-isc arrangement and organization'of these instrumentalities as herein shown and described. l

Figure l represents a horizontal sectional view of an air feeding device for furnaces embodying my invention, the section being taken online tt Figure 2.

Figure. 2 represents a vertical longit iidiiial section the section being taken on line 2-2 Figure l.

Figure 3 represents a perspective view of the air preheating and feeding unit in detached position.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings r- In carrying out my invention, which is applicable to any liouse heating furnace. locoi'notive boiler, stationary boiler, or marine boiler, I position the air preheating and feeding unit above the furnace grate or above the fuel,` in such a way that the. incoming air is thoroughly heated prior to its egress upon the fuel.

In carrying out my invention I have shown oney of the conventional forms of boiler furnaces to which the same is applicable, wherein I designates the boiler, 2 the furnace front, 3 the fue-l door opening, and 4 the fuel door which can'be hinged or supported in any suitable manner. 5 designates the grate upon which the fuel 6 1s tlf) longitudinally extending tubular section which is connected to the front end member 10 by suitable elbows or fittings 13, the rear end of the pipe 12 entering the tee 14, from the rear of which extends the pipe 15 which is of lesser diameter than the pipe 12, said pipe 15 discharging heated air at the port 16 in the rear of the bridge wall 7.

17 designates a pipe depending from the.

posed with respect to the pipes 23, said pipev 25 being slightly longer than the pipes 23 and having ports 26 in the bottom thereof.

In the operation of a furnace of any common type, there is a considerable decrease in the air pressure within the combustion chamber, above the fire, which is due Ato either the natural draft created by the stack or chimney, or an induced draft. By virtue of this decrease in` pressure or vacuum within the furnace, the air is drawn in through the tube 1() from without, as indicatedby the arrow 28 in figure 2, and is discharged under pressure, relative to the interior of the furnace, through the primary distributing tubes 23 and 25 and the opening 26, as indicated by the arrows 29, and also through the auxiliary discharge tube 15 at the opening 16, asindicated by the arrow 30. The tubes 23 and 25 discharge and distribute a primary supply of heated air directly into the path of the highly heated combustible gases above the fuel, while the auxiliary tube 15 supplies a secondary air current into the path of the gases still partly unconsumed, as they pass over the top of the bridge4 Wall 7. Due to the unequal lengths of the distributing tubes l23 and 25, a more uniform distribution and mixing of the air and gases is obtained.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a device of the character stated, an outer air supply tube, an air pre-heating tube extending into the furnace and communicating with the supply tube, a pendant tube carried by the end of the pre-heating tube, a plurality of laterally extending air` distributing tubes carried by the lower end of the pendant tube in proximity to the burning fuel, the central one of said air distributing tubes being longer and extending farther towards the front of the furnace than the other of said tubes, said tubes being closed at their free ends, and having a number of air discharge openingsalong the bottom sides thereof.

2.A In a device of the character' stated, an outer air inlet tube, a horizontally disposed pre-heating tube in communication therewith, a pendant tube communicating with the rear end of said pre-heating tube, and a plurality of laterally extending air distributing tubes carried by and in communication with the lower end of said pendant tube, and a horizontal tube communicating with the rear end of the preheat-ing tube and of lesser diameter than said heating tube extending.l rearwardly over the top of the tire wall of the furnace.

3. In a device of the character stated, an outer air supply tube, an air preheating tube extending into the furnace and com municating with the supply tube, a pendant tube carried by the end of the pre-heating tube, a plurality of laterally extending air distributing tubes carried by the lower end of the pendant tube in proximity to the burning fuel, the central one of said air distributing tubes 'being longer and extending farther towards the front of the furnace than the yother of said tubes, said tubes being closed at their free ends, and having a number of air discharge openings along the bottom sides thereof, a secondary air discharge tube of a lesser diameter than said pre-heating tube communicating with the end of the pre-heating tube and extend- --ing rearwardly thereof, and passing over and supported by the bridge wall, and having an auxiliary-air discharge opening at the rear end thereof.

DANIEL GOFF. 

